The idea is that each map will consist of several randomly picked pre-made cubes that will be different in design and concepts yet linked via doors on each end of the cube. Some would have different doors anywhere from one to six depending on if they have access points on each side. For instance I made a mock up of a really basic four cube map using just a really rough idea on connections

So in this image you have rooms A through D, each are connected by a door way. the color is to show the different styles of cube types used so you have A which seems to have a two access point cube, with doors on adjacent sides connecting to B and C. B being a Three access point cube and C being a four point cube. While D is really just a copy of B just in another rotation. Even though I have only four up here as a mock up we could have more style cubes and then sort each created cube under style and connection type so you could have A_1, A_2, A_3 and so on. Kinda of similar to the board game Carcassonne in the sense of changing layouts with instructions on how to connect. Also wanted to do multi tier such as A could have a stair case and sister cube designed to go with it and provide access points to the second level creating more rooms and increasing the amount of space to fight in.

This is a really roughed out idea and there are more complex thoughts behind such as modifiers to how the access points work like portals that jump access points or what not. If you like the idea or hate the idea let me know.